Question

4a²+9b²+25c²+12ab-30bc-20ca​

Answer 1

Answer:

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Step-by-step explanation:

a2 ± 2ab + b2 = (a ± b)2

a2 - b2 = (a - b)(a + b)

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4a2 + 12ab + 9b2 - 25c2 = [(2a)2 + 2 · 2 · 3ab + (3b)2] - (5c)2 =

= (2a + 3b)2 - (5c)2 = (2a + 3b - 5c)(2a + 3b + 5c)

Answer 2

Answer:

use the identity (a+b+c)^2= a^2+b^2+c^2+2(ab+ bc+ ca)